JP2010064680A - Reservoir tank and brake device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively restrain the movement of a working liquid in tilting, in a technological field of a reservoir tank for storing the working liquid and a brake device using the same, used for a hydraulic brake device and a hydraulic clutch device using hydraulic pressure such as oil pressure. <P>SOLUTION: A reservoir tank body 8 has a working liquid passage 13 arranged between a working liquid supply part 11 for supplying the working liquid from a working liquid injection port and a working liquid storage chamber 12 for storing the working liquid. The working liquid passage 13 is formed in a meandering shape, and a height difference is set between a starting end position 13a and a tail end position 13b so that a bottom height in the starting end position 13a of the working liquid passage 13 connected to the working liquid supply part 11, becomes higher than a bottom height in the tail end position 13b of the working liquid passage 13 connected to the working liquid storage chamber 12, in a vehicle-mounted state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technical field of a reservoir tank used for a hydraulic brake device and a hydraulic clutch device using hydraulic pressure such as hydraulic pressure, and a technical field of a brake device using the same.

  Conventionally, in vehicles such as automobiles, there are vehicles that employ a hydraulic brake device or a hydraulic clutch device using hydraulic pressure. In these hydraulic brake devices and hydraulic clutch devices, a master cylinder that generates hydraulic pressure and a reservoir tank that stores hydraulic fluid supplied to the master cylinder are used.

  In order for the master cylinder to generate a hydraulic pressure when the hydraulic pressure is required, a predetermined amount of hydraulic fluid needs to be stored in the reservoir tank. For this reason, in general, a liquid level detection sensor is provided in the reservoir tank. When the liquid level in the reservoir tank falls below a predetermined level, the liquid level detection sensor detects this and displays it on the liquid level display device. It is like that. By the display of the liquid amount display device, the hydraulic fluid is replenished in the reservoir tank, and the liquid amount in the reservoir tank is ensured to be equal to or higher than a predetermined liquid amount.

By the way, when the vehicle tilts, the reservoir tank also tilts, and the hydraulic fluid in the reservoir tank flows (moves) downward. For this reason, the liquid level of the working fluid may fluctuate and the liquid amount detection sensor may malfunction.
Therefore, conventionally, a reservoir tank is known in which the fluid passage in the reservoir tank is meandered to make it difficult for the hydraulic fluid to flow, so that the fluctuation of the hydraulic fluid level is suppressed even when the reservoir tank is tilted (for example, , See Patent Document 1).
In addition, a reservoir tank is known in which the inside of the reservoir tank is divided into two storage chambers by a partition plate having a notch, thereby suppressing fluctuations in the level of the hydraulic fluid even when the reservoir tank is tilted (for example, , See Patent Document 2).
Japanese Utility Model Publication No. 6-23494. Utility Model Registration No. 2532584.

However, in the reservoir tank disclosed in Patent Document 1, since the liquid passage is merely meandering, depending on the height of the partition wall meandering the liquid passage, the reservoir tank is tilted when the vehicle is tilted. It is conceivable that the liquid moves to the liquid inlet.
Further, in the reservoir tank disclosed in Patent Document 2, the hydraulic fluid moves through the notch when tilted. However, depending on the position of the hydraulic fluid level in the non-tilted state, the hydraulic fluid is similarly applied. May move to the liquid injection port.

  As described above, when the working fluid in the reservoir tank moves greatly to the liquid inlet, the liquid level of the working fluid in the working fluid storage chamber of the reservoir tank greatly fluctuates. For this reason, there is a possibility that the liquid amount detection unit provided in the reservoir tank may erroneously detect the liquid level of the hydraulic fluid and the warning lamp may be erroneously lit.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a reservoir tank capable of effectively suppressing movement of hydraulic fluid during tilting and a brake device using the same. is there.

  In order to solve the above-described problems, a reservoir tank according to the present invention includes a hydraulic fluid supply unit that is supplied with hydraulic fluid from a hydraulic fluid inlet, a hydraulic fluid storage chamber that stores hydraulic fluid, and these hydraulic fluid supply units. And a reservoir tank body having at least a hydraulic fluid passage provided between the hydraulic fluid storage chambers, the hydraulic fluid passage is formed in a meandering shape, and the hydraulic fluid supply section is mounted in a vehicle. The start end position and the end position are set such that the bottom height at the start end position of the hydraulic fluid passage connected to the hydraulic fluid passage is higher than the bottom height at the end position of the hydraulic fluid passage connected to the hydraulic fluid storage chamber. It is characterized in that a height difference is set between.

The reservoir tank according to the present invention is characterized in that the hydraulic fluid passage is formed on a downhill in which at least a part is continuously inclined between the start position and the end position.
Further, in the reservoir tank of the present invention, a height difference is set between the bottom of the hydraulic fluid passage at the end position and the bottom of the hydraulic fluid storage chamber, and the bottom of the hydraulic fluid passage at the end position is The height difference between the bottom of the hydraulic fluid storage chamber is set to be larger than the height difference between the bottom of the hydraulic fluid passage at the start position and the bottom of the hydraulic fluid passage at the end position. It is characterized by.

Furthermore, the reservoir tank of the present invention is characterized in that it has a liquid amount detector at the substantial center of the hydraulic fluid storage chamber.
Furthermore, the reservoir tank of the present invention includes a float chamber in which the liquid amount detection unit communicates with the hydraulic fluid storage chamber by a notch through a cylindrical partition, a float disposed in the float chamber and having a magnet, A limit switch operated by this magnet is provided.

  Furthermore, the brake device of the present invention operates with a reservoir tank that stores hydraulic fluid, a master cylinder that is supplied with hydraulic fluid in the reservoir tank and generates brake pressure during operation, and hydraulic pressure from the master cylinder. The reservoir tank is at least one of the above-described reservoir tanks of the present invention.

  According to the reservoir tank of the present invention configured as described above, the working fluid passage is formed in a meandering shape, and the bottom height at the start end position of the working fluid passage is higher than the bottom height at the end position. Therefore, when the reservoir tank body tilts due to vehicle tilting or when acceleration or deceleration is applied to the vehicle, the backflow of the working fluid in the working fluid storage chamber 12 to the working fluid supply unit (actuation) Liquid movement) can be effectively suppressed. Thereby, the liquid level fluctuation | variation of the hydraulic fluid in a hydraulic fluid storage chamber can be made small.

  In particular, since at least a part of the hydraulic fluid passage from the start position to the end position is formed on a downward slope, it is effective to reversely flow the hydraulic fluid into the hydraulic fluid supply section (moving the hydraulic fluid) in the hydraulic fluid reservoir. In addition, the hydraulic fluid flowing through the hydraulic fluid passage when the hydraulic fluid is supplied can flow smoothly.

  In addition, since the difference in height between the bottom at the end position of the hydraulic fluid passage and the bottom of the hydraulic fluid storage chamber is set large, the backflow of the hydraulic fluid in the hydraulic fluid storage chamber to the hydraulic fluid supply unit (similarly) The movement of hydraulic fluid) can be effectively suppressed. Thereby, the liquid level fluctuation | variation of the hydraulic fluid in a hydraulic fluid storage chamber can be made small.

In addition, since the fluid level detector is provided at the center of the hydraulic fluid storage chamber, even if the hydraulic fluid moves in the hydraulic fluid storage chamber and the fluid level fluctuates, the fluid level detector does not affect the fluid level fluctuation. It can be made difficult to receive.

  Furthermore, since the float chamber of the fluid volume detection unit is substantially isolated from the hydraulic fluid storage chamber by the cylindrical partition wall, even if the hydraulic fluid in the hydraulic fluid storage chamber moves and the liquid level fluctuates, the fluid level detection unit It can be made difficult to be affected by the liquid level fluctuation.

  In this way, the fluctuation of the hydraulic fluid level in the hydraulic fluid storage chamber can be reduced, and the level of the hydraulic fluid in the float chamber of the fluid amount detection unit can be reduced by the fluctuation of the hydraulic fluid level in the hydraulic fluid storage chamber. Since it can be made difficult to receive, the liquid amount detection unit can detect the liquid level of the hydraulic fluid with higher accuracy without being substantially affected by the liquid level fluctuation of the hydraulic fluid in the hydraulic fluid storage chamber as described above, It is possible to effectively prevent the warning lamp from being turned on erroneously.

  On the other hand, according to the brake device using the reservoir tank of the present invention, the movement of the hydraulic fluid in the hydraulic fluid storage chamber of the reservoir tank can be suppressed when the vehicle is tilted, so that the brake operation can be performed more reliably.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically showing a brake device provided with an example of an embodiment of a reservoir tank according to the present invention.

  As shown in FIG. 1, the hydraulic brake device 1 of this example is basically the same as a conventionally known two-system hydraulic brake device. That is, the hydraulic brake device 1 includes a brake pedal 2, a booster 3, a tandem master cylinder 4, a reservoir tank 5, and a brake cylinder 6.

  When the driver depresses the brake pedal 2, the booster 3 operates to boost and output the pedal depression force with a predetermined servo ratio. The primary piston 4a of the tandem master cylinder 4 is actuated by the output of the booster 3 to supply the hydraulic fluid in the primary chamber 4b to the brake cylinder 6 of one system, and the secondary piston 4c is actuated to activate the secondary chamber 4d. The hydraulic fluid is fed to the brake cylinder 6 of the other system. When the loss stroke of each brake system disappears, the tandem master cylinder 4 generates hydraulic pressure. The hydraulic pressure of the tandem master cylinder 4 is transmitted to each brake cylinder 6, each brake cylinder 6 generates a braking force, and each wheel 7 is braked.

  By the way, the reservoir tank 5 used in the brake device 1 of this example stores a hydraulic fluid to be supplied to the tandem master cylinder 4 and opens the container-like reservoir tank main body 8 opened upward, and the reservoir tank main body 8. And a cover 9 that closes the upper end opening. The cover 9 is provided with a hydraulic fluid inlet 10.

2A, 2B, and 3 are perspective views of the reservoir tank body of the reservoir tank of this example as seen from different angles. In the following description, the height of the bottom of each part refers to the height when the reservoir tank is attached to the vehicle body and the vehicle is leveled.
As shown in FIGS. 2A, 2B, and 3, the reservoir tank body 8 of this example includes a hydraulic fluid supply unit 11, a hydraulic fluid storage chamber 12, the hydraulic fluid supply unit 11, and the hydraulic fluid. And a hydraulic fluid passage 13 provided between the storage chambers 12. The hydraulic fluid inlet 10 of the cover 9 is opposed to a position 11 a indicated by a two-dot chain line of the hydraulic fluid supply unit 11. Normally, the reservoir tank body 8 is covered with a cover 9 and the upper end opening of the reservoir tank body 8 is closed. Accordingly, the working fluid is supplied through the working fluid inlet 10 of the cover 9 to the working fluid supply unit 11.
Will be supplied to.

  A liquid amount detection unit 14 is disposed substantially at the center of the hydraulic fluid storage chamber 12. The liquid amount detection unit 14 detects the amount of hydraulic fluid stored in the hydraulic fluid storage chamber 12. Although not shown, the liquid amount detection unit 14 includes, for example, a float disposed in a float chamber 14b surrounded by a cylindrical partition wall 14a and having a magnet, and a limit switch operated by the magnet. The float chamber 14b is always in communication with the hydraulic fluid storage chamber 12 on the outer periphery of the cylindrical partition wall 14a through a small gap passage (notch) (not shown) so that the hydraulic fluid enters the float chamber 14b. In that case, the level of the hydraulic fluid in the float chamber 14b and the level of the hydraulic fluid in the hydraulic fluid storage chamber 12 are always the same.

  Then, the float moves up and down in accordance with the height of the hydraulic fluid level in the float chamber 14b, the hydraulic fluid in the hydraulic fluid storage chamber 12 decreases, and the hydraulic fluid level reaches the specified value. Then, the float also has a height position corresponding to the height of the liquid surface. At this time, the magnet activates the limit switch at the height position of the float to light the warning light.

  In that case, when the reservoir tank body 8 is tilted due to vehicle tilting or when acceleration or deceleration is applied to the vehicle, the working fluid in the working fluid storage chamber 12 moves and the liquid level fluctuates. In the central region of the working fluid storage chamber 12, the fluid level fluctuation of the working fluid is relatively small. And since the liquid quantity detection part 14 is provided in the approximate center of the hydraulic fluid storage chamber 12, even if the reservoir tank main body 8 inclines, it is hard to receive to the influence of a liquid level fluctuation | variation. Therefore, even if the reservoir tank main body 8 is tilted, the liquid amount detection unit 14 detects the liquid level of the hydraulic fluid with relatively high accuracy, and erroneous lighting of the warning lamp is prevented. Moreover, when the liquid level of the hydraulic fluid in the hydraulic fluid storage chamber 12 fluctuates as described above, the liquid level fluctuation in the float chamber 14b is suppressed by the cylindrical partition wall 14a. As described above, the liquid level of the hydraulic fluid is detected with high accuracy without being substantially affected by the liquid level fluctuation of the hydraulic fluid in the hydraulic fluid storage chamber 12, and erroneous lighting of the warning lamp is further effectively prevented.

  The hydraulic fluid storage chamber 12 includes a primary fluid storage chamber 12a that communicates with the primary chamber 4b of the tandem master cylinder 4 and a secondary fluid storage chamber 12b that communicates with the secondary chamber 4d. The primary liquid storage chamber 12a and the secondary liquid storage chamber 12b are partitioned by a partition wall 12c. In that case, the height of the partition wall 12c is set to be lower than the heights of the peripheral wall 12e of the hydraulic fluid storage chamber 12 and the cylindrical partition wall 14a. Accordingly, the primary liquid storage chamber 12a and the secondary liquid storage chamber 12b communicate with each other at the upper part thereof.

  The bottom 11 b of the hydraulic fluid supply unit 11 is set at a position higher than the bottom 12 d of the hydraulic fluid storage chamber 12. Further, the hydraulic fluid passage 13 has a start end position such that the bottom height at the start end position 13 a connected to the hydraulic fluid supply unit 11 is higher than the bottom height at the end position 13 b connected to the hydraulic fluid storage chamber 12. A height difference is set between 13a and the end position 13b. The bottom of the hydraulic fluid passage 13 connecting the hydraulic fluid supply unit 11 and the hydraulic fluid storage chamber 12 is inclined downward so as to continuously lower from the hydraulic fluid supply unit 11 toward the hydraulic fluid storage chamber 12. It has become.

  In this way, the hydraulic fluid in the hydraulic fluid storage chamber 12 is made to be hydraulic fluid by setting the bottom height at the starting end position 13a of the hydraulic fluid passage 13 to be higher than the bottom height at the terminal end position 13b. Even if the vehicle tilts in the direction of flowing back toward the hydraulic fluid supply unit 11 through the passage 13, the hydraulic fluid is prevented from flowing back (moving) toward the hydraulic fluid supply unit 11. That is, the liquid level fluctuation of the hydraulic fluid in the hydraulic fluid storage chamber 12 is small. Therefore, the liquid level detection unit 14 detects the liquid level of the hydraulic fluid with high accuracy without being substantially affected by the liquid level fluctuation of the hydraulic fluid in the hydraulic fluid storage chamber 12 as described above, and an error in the warning lamp is detected. Lighting is further effectively prevented.

  Moreover, the bottom of the hydraulic fluid passage 13 at the end position 13 b is higher than the bottom of the hydraulic fluid storage chamber 12. In this case, the height difference between the bottom at the start position 13a and the bottom at the end position 13b is relatively small, but the difference in height between the bottom at the end position 13b of the hydraulic fluid passage 13 and the bottom of the hydraulic fluid storage chamber 12 is It is set relatively large. And the side wall of the hydraulic fluid storage chamber 12 in the boundary part with the terminal position 13b is formed in the vertical wall (a vertical wall with respect to the bottom of the hydraulic fluid storage chamber 12). Therefore, the hydraulic fluid that flows into the hydraulic fluid storage chamber 12 via the hydraulic fluid passage 13 falls substantially vertically from the end position 13b.

  As described above, the difference in height between the bottom at the end position 13b of the hydraulic fluid passage 13 and the bottom of the hydraulic fluid storage chamber 12 is set large, so that the above-described reverse flow of the hydraulic fluid in the hydraulic fluid storage chamber 12 ( The movement of the hydraulic fluid) is further effectively suppressed. That is, the liquid level fluctuation of the hydraulic fluid in the hydraulic fluid storage chamber 12 is small. Therefore, the liquid level detection unit 14 detects the liquid level of the hydraulic fluid with high accuracy without being substantially affected by the liquid level fluctuation of the hydraulic fluid in the hydraulic fluid storage chamber 12 as described above, and an error in the warning lamp is detected. Lighting is further effectively prevented.

  The hydraulic fluid passage 13 includes a partition wall 15 between the hydraulic fluid supply unit 11 and the hydraulic fluid passage 13, a fluid passage wall 13 c connected to the partition wall 15 and extending from the start end position 13 a, and the hydraulic fluid passage 13. The outer peripheral wall 13d and the partition wall 16 between the hydraulic fluid storage chamber 12 and the hydraulic fluid passage 13 connected to the outer peripheral wall 13d and extending from the start position 13a are formed in a meandering shape. Therefore, as shown by the arrow α in FIG. 3, when supplying the hydraulic fluid, the hydraulic fluid meanders through the hydraulic fluid passage 13 and flows.

  By forming the hydraulic fluid passage 13 in a meandering shape in this way, the above-described reverse flow (movement of the hydraulic fluid) of the hydraulic fluid in the hydraulic fluid storage chamber 12 is further effectively suppressed. That is, the liquid level fluctuation of the hydraulic fluid in the hydraulic fluid storage chamber 12 is small. Therefore, the liquid level detection unit 14 detects the liquid level of the hydraulic fluid with high accuracy without being substantially affected by the liquid level fluctuation of the hydraulic fluid in the hydraulic fluid storage chamber 12 as described above, and an error in the warning lamp is detected. Lighting is further effectively prevented.

  2 (a) and 3 is a hydraulic fluid supply port connected to the clutch master cylinder. Although not shown, the hydraulic fluid supply port 17 communicates with a clutch fluid storage chamber provided in the reservoir tank body 8 and partitioned from the primary fluid storage chamber 12a and the secondary fluid storage chamber 12b. Moreover, although each hydraulic-fluid supply port to a tandem master cylinder is provided in each bottom of the primary liquid storage chamber 12a and the secondary liquid storage chamber 12b, illustration is abbreviate | omitted.

  According to the reservoir tank 5 of this example, the hydraulic fluid passage 13 is formed in a meandering shape, and the bottom height at the start end position 13a of the hydraulic fluid passage 13 is higher than the bottom height at the end position 13b. Therefore, when the reservoir tank body 8 tilts due to vehicle tilting or when acceleration or deceleration is applied to the vehicle, the backflow of the working fluid in the working fluid storage chamber 12 to the working fluid supply unit 11 occurs. (Movement of hydraulic fluid) can be effectively suppressed. Thereby, the liquid level fluctuation | variation of the hydraulic fluid in the hydraulic fluid storage chamber 12 can be made small.

  In particular, since the hydraulic fluid passage 13 is formed on a downward slope from the start position 13a to the end position 13b, the backflow of the hydraulic fluid in the hydraulic fluid storage chamber 12 to the hydraulic fluid supply section 11 (movement of the hydraulic fluid) is effective. In addition, the hydraulic fluid flowing through the hydraulic fluid passage 13 can be smoothly flowed when the hydraulic fluid is supplied.

Further, since the height difference between the bottom at the end position 13b of the hydraulic fluid passage 13 and the bottom of the hydraulic fluid storage chamber 12 is set large, the hydraulic fluid supply of the hydraulic fluid in the hydraulic fluid storage chamber 12 is similarly performed. Backflow (movement of hydraulic fluid) to the portion 11 can be effectively suppressed. Thereby, the hydraulic fluid storage chamber 12
The liquid level fluctuation | variation of the inside hydraulic fluid can be made small.

  Further, since the float chamber 14b of the liquid amount detection unit 14 is provided at the substantially center of the hydraulic fluid storage chamber 12, even if the hydraulic fluid in the hydraulic fluid storage chamber 12 moves and the liquid level fluctuates, the liquid amount is detected. The part 14 can be made less susceptible to the influence of the liquid level fluctuation.

  Further, since the float chamber 14b of the liquid amount detection unit 14 is substantially isolated from the hydraulic fluid storage chamber 12 by the cylindrical partition wall 14a, even if the hydraulic fluid in the hydraulic fluid storage chamber 12 moves and the liquid level fluctuates. The liquid amount detection unit 14 can be made less susceptible to the liquid level fluctuation.

  As described above, the fluctuation of the hydraulic fluid level in the hydraulic fluid storage chamber 12 can be reduced, and the hydraulic fluid level in the float chamber 14b of the liquid amount detection unit 14 can be changed to the operation in the hydraulic fluid storage chamber 12. Since the liquid level detection unit 14 can hardly be affected by the fluctuation of the liquid level of the liquid, the liquid level detection unit 14 can change the liquid level of the working liquid without being affected by the liquid level fluctuation of the working liquid in the working liquid storage chamber 12 as described above. Detection can be performed with higher accuracy, and erroneous lighting of the warning light can be effectively prevented.

4A, 4B, and 5 are perspective views of reservoir tank bodies of other examples in the embodiment of the reservoir tank of the present invention as seen from different angles.
As shown in FIGS. 4A, 4B, and 5, in the reservoir tank body 8 of this example, the length of the liquid passage wall 13c is shorter than that of the above example. Further, the partition wall 16 is folded at a substantially right angle from the portion 16a at the end position 13b of the hydraulic fluid passage 13 and a portion 16a extending in the extending direction of the portion 13d 'perpendicular to the longitudinal direction of the reservoir tank body 8 of the outer peripheral wall 13d. And a bent portion 16b. The length of the portion 16b of the partition wall 16 at the terminal position 13b is also set short. Furthermore, the interval between the partition wall 15 and the portion 16a of the partition wall 16 is set shorter than the above example.

According to the reservoir tank 5 of this example, the meandering shape of the hydraulic fluid passage 13 is smaller than the above-described example, and the meandering flow of the hydraulic fluid when the hydraulic fluid is replenished is small. 4 (a), 4 (b), and 5 show a notch 18 that connects the hydraulic fluid storage chamber 12 and the float chamber 14b, and a clutch that communicates with the hydraulic fluid supply port 17. A liquid storage chamber 19 is shown.
Other configurations and other operational effects of the reservoir tank 5 of this example are the same as those of the above-described example.

On the other hand, according to the hydraulic brake device 1 using the reservoir tank 5 of each example described above, the movement of the hydraulic fluid in the hydraulic fluid storage chamber 12 of the reservoir tank 5 can be suppressed when the vehicle is tilted. Can be performed more reliably.
In addition, this invention is not limited to the above-mentioned example, A various design change is possible within the range of the matter described in the claim.

The reservoir tank according to the present invention is used in a hydraulic brake device or a hydraulic clutch device that uses hydraulic pressure such as hydraulic pressure, and can be suitably used as a reservoir tank that stores hydraulic fluid.
Moreover, the brake device according to the present invention can be suitably used for a brake device that brakes a wheel using hydraulic fluid stored in a reservoir tank.

It is a figure showing typically a brake equipment provided with an example of an embodiment of a reservoir tank concerning the present invention. (A), (b) is the perspective view which looked at the reservoir tank main body of the reservoir tank of the example shown in FIG. 1 from each different angle. It is the perspective view which looked at the reservoir tank main body of the reservoir tank of the example shown to Fig.2 (a), (b) from another different angle. (A), (b) is the perspective view which looked at the reservoir tank main body of the reservoir tank of the other example in the embodiment of the reservoir tank concerning this invention from each different angle. It is the perspective view which looked at the reservoir tank main body of the reservoir tank of the example shown to Fig.4 (a), (b) from another different angle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hydraulic brake device, 2 ... Brake pedal, 3 ... Booster device, 4 ... Tandem master cylinder, 5 ... Reservoir tank, 6 ... Brake cylinder, 8 ... Reservoir tank main body, 9 ... Cover, 10 ... Hydraulic fluid inlet DESCRIPTION OF SYMBOLS 11 ... Hydraulic fluid supply part, 11b ... Bottom, 12 ... Hydraulic fluid reservoir, 12a ... Primary fluid reservoir, 12b ... Secondary fluid reservoir, 12c ... Partition wall, 12d ... Bottom, 13 ... Hydraulic fluid passage, 13a ... Start end position, 13b ... Terminal position, 13c ... Liquid passage wall, 13d ... Outer peripheral wall, 14 ... Liquid amount detection part, 14a ... Cylindrical partition wall, 14b ... Float chamber, 15, 16 ... Partition wall

Claims (6)

A hydraulic fluid supply unit that supplies hydraulic fluid from the hydraulic fluid inlet, a hydraulic fluid storage chamber that stores hydraulic fluid, and a hydraulic fluid passage that is provided between the hydraulic fluid supply unit and the hydraulic fluid storage chamber In a reservoir tank comprising at least a reservoir tank body,
The hydraulic fluid passage is formed in a meandering shape,
In a vehicle-mounted state, the bottom height at the start end position of the hydraulic fluid passage connected to the hydraulic fluid supply unit is higher than the bottom height at the end position of the hydraulic fluid passage connected to the hydraulic fluid storage chamber. Further, a difference in height is set between the start position and the end position.   2. The reservoir tank according to claim 1, wherein the hydraulic fluid passage is formed in a downward slope in which at least a part is continuously inclined between the start end position and the end position. A height difference is set between the bottom of the hydraulic fluid passage at the end position and the bottom of the hydraulic fluid storage chamber,
The difference in height between the bottom of the hydraulic fluid passage at the end position and the bottom of the hydraulic fluid storage chamber is between the bottom of the hydraulic fluid passage at the start position and the bottom of the hydraulic fluid passage at the end position. The reservoir tank according to claim 1, wherein the reservoir tank is set to be larger than a difference in height of the reservoir tank.   The reservoir tank according to any one of claims 1 to 3, further comprising a liquid amount detection unit at substantially the center of the hydraulic fluid storage chamber.   The liquid amount detection unit includes a float chamber communicating with the hydraulic fluid storage chamber by a notch through a cylindrical partition, a float disposed in the float chamber and having a magnet, and a limit switch operated by the magnet. The reservoir tank according to claim 1, further comprising a reservoir tank. At least a reservoir tank that stores hydraulic fluid, a master cylinder that is supplied with hydraulic fluid in the reservoir tank and generates a brake pressure during operation, and a brake cylinder that operates with hydraulic pressure from the master cylinder;
The brake device according to claim 1, wherein the reservoir tank is the reservoir tank according to claim 1.

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